body {
    background-image: url('background.gif');
    // background-size: cover; /* 背景图片铺满整个页面 */
    // // background-position: center; /* 居中对齐 */
    // background-repeat: no-repeat; /* 禁止重复平铺 */
    margin: 0;
    padding: 0;
    background-size: cover;
    display: flex;
      justify-content: center;
      align-items: center;
  }
  .box1{
    display: inline-block; 
    min-height: 300px;
     overflow: auto;
    background-color: rgba(248, 248, 248, 0.7);;
    margin-top: 100px;
    border-radius: 10px;
  }